problems with stepspeed gearbox

hi, I recently bought a 2001 MGF stepspeed.it had broken gearbox (wasn't driving in any gears).after much research on this good site, I removed the box sump and out fell handfuls of what looked like chain links.told me bands had broke so new gearbox required!.i have since replaced engine and gearbox as the original had boiling up problems.engine is now running well with no overheating issues.My problem is the gearbox is not driving in any gears again!!.I have used new cvt oil from local bmw/mini dealer which wasn't cheap (atf 5) was part number they said that was the new number from ezl799.it is selecting through all positions the only movement you get is if you give it a rev, then the friction from the diff sends one wheel turning but any resistance stops wheel.dash only shows D1 and 2 and R.i have since removed sump and found 3 small pieces of metal and fingertip full of metal powder in sump.ile try and post pictures.the guy I bought engine and box from says the car drove on and off recovery wagon and was driving in all gears on axle stands as couldn't be roadtested as was accident damaged.could it be something electronic or does the 3 pieces of metal suggest serious mechanical failure.next step is to remove all again!!!.(not letting me add pictures for some reason), 2 of the pieces of metal were about140mm long and were curved and resembled broken parts of piston rings. any ideas? HELP

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